I didn't watch the video yet but heard "The Veteran" and his story about carrying an M4 and it made me wonder what his job actually was? If I had to guess it would probably be something involving psychological warfare. You could really hear the animosity coming out of his voice when he referred to our side.
So I looked up Chris Marvin Everytown since he is on their "advisory council" and found the Marvin Strategies website. It looks like a freelance marketing outfit, but who knows with all the trillions getting thrown around these days? His bio says he "served for seven years as a U.S. Army officer and Black Hawk helicopter pilot" and he was combat wounded but that's about it as far as details.
Anyway this was on their front page. Kinda creepy if you ask me. Also he's on a first name basis with legislators. He got a "thank you Chris" from Wakai at the end of his testimony.

Although I'm not attempting to diminish his service in a combat zone, his record, which he believes gives his opinion more validation over everyone else's, seems quite stretchy.
He was not combat wounded, as he was not a recipient of the purple heart. Having searched the database, I was unable to find any record of him receiving a purple heart, meaning that the helicopter crash that he constantly references was not due to enemy contact or engagement. In contrast, I was able to find every friend severely injured or KIA in seconds.
I see no indication that he was awarded the bronze with with combat valor distinction (the "V"), which is a major defining factor between the types of bronze stars awarded. You can get a bronze star without the V for meritorious service and achievement, which coincides with the other medals he publicly presents: the meritorious service medal and the air service medal. When your factor in that his aviation and military career ended after that crash, it become a little more apparent that his bronze likely has nothing to do with engaging enemies; especially engagement with an "M4".
And having served in the same combat zone, I can 99% guarantee he did not "carry his M4" in the same capacity that we did. He was a Blackhawk pilot, not a gunner, with even the latter having very little use for their primary weapon while on aerial missions. And Assuming he wasn't running dismounted missions while attached to infantry or SOC units, he likely never left his chopper outside the wire and likely only had to "carry his M4" while back on base, Camp or FOB.